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TOPIC: 76 KZ900 swingarm and bigger tire

76 KZ900 swingarm and bigger tire 09 Feb 2009 19:09 #263398

  • shadow44
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Question for all of you with more experience at this. I want a bigger tire on my 76 KZ900. The stock tire looks sissiefied. Hte bike is over 80hp stock, and it just looks to me like it needs more tire. I am just like everybody else, and don't have tons of money to just dump on this. I knwo there is a swing arm out there, that can get me up to a bigger tire, I have heard that a ZXR swing arm will work, anybody got any good success stories, with the details? How wide? Modifications required? offset chain details?
Thanks!
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76 KZ900 swingarm and bigger tire 09 Feb 2009 19:43 #263408

  • StreetfighterKz
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Have you tried using the "search forum" function? Just search for "swingarm swap" or "wider tire" or something like that. Who knows maybe you'll be able to find more info than what you asked for.

Later, Doug

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1978 z1000 Streetfighter
1976 z900 Stripfighter (work in progress)
1983 Gpz750 Resto-Mod
1989 Vmax

76 KZ900 swingarm and bigger tire 10 Feb 2009 00:30 #263474

  • donthekawguy
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The biggest tire you can use with the stock arm is a 130 with a cast wheel. You could use a gs1100e swingarm and fit a 140 in it. But you will have to buy a wider rim and have it laced up. Cha ching. Or find a suzuki rear wheel thats already wider like I did. :P

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Rathdrum Idaho
1971 Kawasaki g3ss
1972 Yamaha R5 350
1965 Suzuki Hillbilly
1964 Yamaha 125

76 KZ900 swingarm and bigger tire 10 Feb 2009 14:50 #263591

  • mark1122
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I did the ZRX arm it wasnt too hard but it can get expensive.Its cheaper and easier if u buy a complete rear end.
I bought the rear end complete from a wrecker on the net for $700.
u need a whole new rear end by the time u are done.
Hear is my project page.
kzrider.com/index.php?option=com_kunena&...w&catid=11&id=103381

Then u need to change the front rim to match the rear.and of caurse u need wider forks for that wider rim.lol. it just keeps going.:woohoo:
I have a spare set of zx12 forks.

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76 kZ, frame gusset work,1200CC.Ported by Larry Cavanaugh,This email address is being protected from spambots. You need JavaScript enabled to view it., 1.5mm.over intakes,.ZRX12 rear end,and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg,Ont.Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)
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76 KZ900 swingarm and bigger tire 11 Feb 2009 05:58 #263765

  • Z1109R Fin
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well, on projects -file there´s a topic "Swing swap - finally a ZRX -swing":P

kzrider.com/index.php?option=com_kunena&...w&catid=11&id=254238

I haven´t updated it for some time, sorry. Should take some pics and update.

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Z1000R ´83...Slightly modified...

76 KZ900 swingarm and bigger tire 12 Feb 2009 08:22 #264137

  • trianglelaguna
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i was looking at the zrx swap too....finally i am just gonna brace my swingarm and run the best skinny (130) i can...i grew up in a group of guys that had 130 tires ,r90s,gs1100,kz,z1,,,,we never had any problems scraping the metal goodies ..and short of a track bike you can steer quicker too..my 2 cents....mark1122 is speaking common sense...where do you get done money and time wise once you start swapping????
allthough it is the trend here and looks bad to the bone...

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1976 KZ900
2003 ZX12R
2007 FZ1000
2004 ninja 250R for wife

76 KZ900 swingarm and bigger tire 12 Feb 2009 23:42 #264578

  • donthekawguy
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One post. I think we scared him off. :laugh:

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Rathdrum Idaho
1971 Kawasaki g3ss
1972 Yamaha R5 350
1965 Suzuki Hillbilly
1964 Yamaha 125

76 KZ900 swingarm and bigger tire 13 Feb 2009 03:06 #264594

  • Old Man Rock
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Naw Don, you avatar did...

Made him poopy pants once he figured this was going to cost more than $100... :laugh: :laugh: :laugh:

OMR

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1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
Keihin, 29mm CR specials
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter

Phoenix, Az

76 KZ900 swingarm and bigger tire 13 Feb 2009 05:02 #264602

  • Z1109R Fin
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trianglelaguna wrote:

....mark1122 is speaking common sense...where do you get done money and time wise once you start swapping????


So true. I´m now finalizing version 1.7 of my ELR:laugh:

Bigger mods so far:
- front: Stock -> ZXR750 ´90 -> GSXR1100 ´98 USD
- rear: Stock -> GSXR1000 ´90 -> ZRX1100 ´98
- Brakes: Today got Tokico 6-piston in front and 2-piston rear
- Lost count on exhausts...Micron -> Laser -> Kerker K -> Kerker Megaphone

etc, etc:P Every winter ya gotta do somethingB)

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Z1000R ´83...Slightly modified...

76 KZ900 swingarm and bigger tire 13 Feb 2009 06:00 #264607

  • shadow44
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To Old Man Rock (User)
Spoken like a true idoit. Your true colors have shone! Be proud!:angry:

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76 KZ900 swingarm and bigger tire 13 Feb 2009 06:16 #264614

  • shadow44
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B) Ok now that we have punished the children, we can move on.

I still think there is a way to put another swingarm on here without cutting welding or drilling. I do not want to alter my frame. I dont really care for the looks of the zrx arm because of the extra bar. There has go to be another way.

Well if we drop the swingarm for a minute, anybody tell me how wide you can go before you have to offset your chain? and a 5/8" offset, how wide can that get ya?

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76 KZ900 swingarm and bigger tire 13 Feb 2009 06:31 #264618

  • tw..
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130 is about as wide as you can go in a stock KZ swingarm and I believe 140 with a stock suzuki GS swingarm without an offset.

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2-1976 KZ900 A4
1995 KZ1000 Police bike
1978 Z1R

76 KZ900 swingarm and bigger tire 13 Feb 2009 06:34 #264619

  • tw..
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Oh and BTW, I put my swingarm on with a 190 rear tire and a 5/8 offset without modifying the frame. The picture in my avitar is an old pic. I have since put a zx7 front end on with matching wheels.

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2-1976 KZ900 A4
1995 KZ1000 Police bike
1978 Z1R

76 KZ900 swingarm and bigger tire 13 Feb 2009 06:39 #264621

  • shadow44
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tw.. wrote:

Oh and BTW, I put my swingarm on with a 190 rear tire and a 5/8 offset without modifying the frame. The picture in my avitar is an old pic. I have since put a zx7 front end on with matching wheels.


:cheer: :cheer: :cheer: See I knew it could be done!! Details.... I need all the nasty details...:woohoo: :woohoo: :woohoo:

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76 KZ900 swingarm and bigger tire 13 Feb 2009 06:56 #264625

  • tw..
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I'm sure I've already posted this before somewhere inthe archives, but here goes.

First thing to do is open your wallet and don't be to concerned with price cause it's gonna cost.

Custom 4-6 over swingarm made to mount directly to the KZ frame.

Struts. I didn't trust shocks. They might cause rear end to bottom out on rear tire.

Front and rear alum rims.

New bearings for rims to accept KZ axles.

New tires.

5/8 offset front sprocket, new rear sprocket, new extended chain. All 530 pitch.

Custom made spacers to align rear tire.

Complete ZX7 rear brake system.

Shorten kickstand.

Complete ZX7 front end.

Modified front sprocket cover to accept 5/8 offset sprocket.

Many hours of labor, too many to count.

I think thats it but I'm sure I've missed something.

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2-1976 KZ900 A4
1995 KZ1000 Police bike
1978 Z1R

76 KZ900 swingarm and bigger tire 13 Feb 2009 06:58 #264626

  • tw..
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Oh I forgot the extended tag bracket and new tail light with integrated turn signals.

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2-1976 KZ900 A4
1995 KZ1000 Police bike
1978 Z1R

76 KZ900 swingarm and bigger tire 13 Feb 2009 07:14 #264628

  • Russ Jackson
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shadow44 wrote:

To Old Man Rock (User)
Spoken like a true idoit. Your true colors have shone! Be proud!:angry:




Easy shadow I think he was just joking around. By the way Idoit is spelled Idiot. Lighten up a little...Russ

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1976 KZ 900 B1 29 smoothbores, Kerker, Lester Mags
2008 Kawasaki Concours 14 abs

76 KZ900 swingarm and bigger tire 13 Feb 2009 07:27 #264632

  • shadow44
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Russ Jackson wrote:

shadow44 wrote:

To Old Man Rock (User)
Spoken like a true idoit. Your true colors have shone! Be proud!:angry:




Easy shadow I think he was just joking around. By the way Idoit is spelled Idiot. Lighten up a little...Russ


Well I did write before I had coffee:blink:

Now I have had coffee:woohoo:

I dont care to open my wallet, I just see no reason to modify the frame. I was looking to just get into about a 6-7" tire without extending the the swingarm. I guess I will be better off just going at it on my own. Thanks for the info.

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76 KZ900 swingarm and bigger tire 13 Feb 2009 07:32 #264633

  • tw..
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Anything can be done. It may look a little boxy modifying a stock length swingarm to suddenly be wide enough for a 200 tire.

Give a go and post your results, findings and pictures to the group.

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2-1976 KZ900 A4
1995 KZ1000 Police bike
1978 Z1R

76 KZ900 swingarm and bigger tire 13 Feb 2009 07:35 #264634

  • trianglelaguna
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hang tight ...someone on here has most likely been down the same path and will chime in....if you do get a answer and can achieve your goal with out a frame mod/or much...you can have a stock arm and set up to switch back and forth...now would'nt that be special....
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1976 KZ900
2003 ZX12R
2007 FZ1000
2004 ninja 250R for wife
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